We use PHP & Laravel for the core Street platform, and we try to keep up to date with the latest versions of both. At the moment, we're on PHP 8 and Laravel 8. We're also using Vue.js for some of our frontend components, and AWS for our infrastructure.
For our mobile app development, we use React Native, Redux, and Bitrise for our pipeline.
However, we're fairly open-minded when it comes to using whatever tools and technologies are right for the job at hand.